Method of and machine for nailing heels



Nov. 3, 1931. H. PRENZEL. 1,830,522

. METHOD OF AND MACHINE FOR NAILING HEELS Filed Jul 12. 1927 4 Sheets-Sheet 1 ATTORNEYS Nov. 3, 1931. A. H. PRENZEI.

METHOD OF AND MACHINE FDR NAITJING HEELS v Filed July 12, 1927 4 Sheets-Sheet 2 A 7'TUF/VEY WITNESS fil y/ QM U 45 v 77 I9 52 I V Z/O l 111,, 53 7 I 511.

l j: 56 r, S

V I INVENTOR Nov. 3, 1931.

A. H. PRENZEL Filed Ju ly 12, 192'? 4 Sheets-Sheet 3 lllllv I n 57 g ATTORNEYS Nov. 3, 1931 A. H. PRENZEL METHOD OF AND MACHINE FOR NAILING HEELS Filed July 12, 1927 4 Sheets-Sheet 4 ATTORNEYS.

ZZZ/4??? Patented Nov. 3, 193i was 5-1 I pawn:

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ADAM H. PRECN'IZEL, OF HALIFAX, NSYTJViNIA, ASSIGNOB TO UNITED SHQE IvIA- CHINERY' CQEZPORATIQIQ, OF PATERSON, NEW JERSEY, A

. JERSEY Application filed July 112,

This invention relates to a method of and machine for driving nails into the heels of boots and shoes and more particularly to nail inserting mechanism having especial advanta ges when used to attach rubber heels.

As the employment of rubber heels in the original factory production of shoes becomes more and more prevalent, the need for an efficientuiailing machine for rubber heels which is not subject to the disadvantages and productive of the waste of material attendant upon the operation of such machines as are now used, becomes increasingly apparent.

As manufacturedrubber heels have their tread faces formed with bosses encircling nailing holes axially alined with washers which are embedded in the body of the heel substantially above the tread face and providing an ornamental appearance for the heel while also forming suction cups to prevent or reduce slipping. The patterns in which these bosses and hol s are arranged vary, not only as'to spacing but as to arrangement with difi'erent makes and sizes of heels. V i

The nailing machines as now employed 0 proposed for attaching rubber heels to shoes re subject to the following disadvantages; gang drivers operating through pattern plates (a series ofwhich are quite expensive) cannot adapt themselves to manufacturing inequalities of depth 1 and relative locations of the washers with misalinement resulting in ruined rubber heels and possible damage to the driver; as heretofore practised, no allowance hasbeen made for the resilience of the compressedrubber of the heel in the'driving of the nail with the consequence that the nails'are driven to bring their heads against the washers and are either pulled looseby the back springof the rubber after drivingpressure is removed, or result at such points 'in distorting the edge otthe heel and harm- 'fully affecting the appearance of thefinished job no adequate guiding means has been provided i'orthe nails so that they sometimes are driven in at anangle and fail to clinch; and where the washers are located close to the edge of the heel the method of inserting nails and the applying mechanism now used frequently, throu hinadequate guiding, drives METHOEj G 0R- NAILIBTG HEELS 192?. Serial No. 295,151.

in a manner to cure these defects andobjections and an advantageous form of nailing mechanism with the aid of which the method may be practised and which embodies novel structure to that end are discussed and (BX-V plained in detail in the following specification reference being had to theaccompanv inp drawingsiorming part thereof and in which:

Figure l represents'a well known type of nailing machine of the single reciprocating driver type to which the mechanical improvements of the present invention may advantageously be applied in exemplifying the inventive method and mechanical features involved therein.

Figure 2 is a detail in front elevation of the race way, driving nozzle and heel gauge with a supported shoe having its heel positioned and adjusted to the gauge, parts being shown in section. i r 1.,

Figure 3 is a similar view, but with the shoe support moved to insert the driver nozfZle in a washer opening in the rubber heel of the supported shoe and to apply "compression to the rubber heel through the washer.

Figure 4c :is a plan view of the adjustable shoesupport... I

Figure 5 is asdetail, of the supportshowing the shock absorbing and compression applyspring oi xthe shoe support. 7 re 6 is a view in elevationon an ened scale of the nailhopper, race way and driving head with the nozzle and part of the race way'in section and toe nozzleshown as in pressure applying relation to a heel imbedded washer.

Figure 7 is a vertical sectional View on an enlarged scale through the nozzle and shoe heel with the nail driven position ofthe parts 9 conronarron on ,NEW

head after the nail is fully driven and pressure removed.

Figure 9 is a horizontal section on the line 99 of Figure 7.

Figure 10 is a bottom plan of the nozzle.

Figure 11 is a detail'of one of the nail the appearance of the finished job at that V guiding spring clips of the nozzle.

Figure 12 is a vertical section through the shoe supporting table. r

Figure 13 is a horizontal section on the line 13-18 of Figure 12.

Figure 14 is a vertical section on a large scale illustrating the method of and means for driving nails through heel washers at the edge of the shoe toward the median line of the shoe.

' Figure 15 1s a detail of the driving nozzle I detached. 7

Figure 16 is a detail of the angular nozzle treadgauge used in Figure 14:.

Figure 17 is a verticalsection of a modified form of nozzle embodying an angular nozzle tread gage having similar functions.

Figure 18 is a section. of said nozzle gage detached and in operative position on the tread of a shoe heel. p r

Figure 19 is a bottom plan of the modified nozzle shown in Figure 17 and Figure 20 is a detail of the gage plate and j nozzle-carried indicator cooperating therewith to scale and indlcate the degree of longitudinal adyustment of the nozzle relatively -to the nail driving plunger.

In the method of attaching rubber heels to shoes involved herein, advantage is taken of the cup shaped suction holes and bosses, which both ornament and form anti-slip treads for the heel surface and which in the manufacturingof rubber heels are axially aligned with the metal fastener retaining washers which are imbedded in the material of the heel in process of manufacture. ,A

nail guiding and driving instrumentality is engaged with one of these imbedded washers upon a heel mounted for attachment upon a shoe, the latter of course being mounted upon a suitable support, and pressure is applied in "a directionto cause compression of the rubber material ofthe heel between the washers and what I may term the shoe face of the rubber heel. While this pressure is being applied a nail or similar headed fastening is driven through the centralaperture of the -washer and into the material of the shoe where its end issuitably clinched as by the metal heel plate of the last, but with the head of the nail arrested before reaching the imbedded washer and therefore spaced from the washer. Upon the removal of the compression against the rubber material after the nail has been driven as described, the

resiliency of the compressed material results in natural expansion, which will move the metal washer back toward the head of the nail to take up the space between the washer from the imbedded washer. trates this heel with the pressure removed and nail. Such a method of attaching the rubber heel therefore, prevents spoiling the rubber heels on shoes through driving'the nail through the washers initially or through the back spring of the rubber distorting the rubber at theedge of theheel and spoiling point, as previously stated. The described operation maybe performed upon successive washers of the heel or. gang"lnstrumentahties fastening nail is-not properly guided causes the nail to turn off at an angle to the outside edge of the shoe and to penetrateandscar the bottom edge of the upper adjacent to the lineof the heel. My improved method of fastening prevents this, and consists in holding the heel on the shoeunder pressureand in driving the nail. through the rubber heel at its edge and throughthe opening ofthe washers with the=nail and heel relatively inclined toward themedian line of the shoe. Theperformance of this method by appropriate instrumentalities is illustrated in Figure 14 of the drawings. Advantageously,

in performing this operation, the imbedded metal washer maybe and preferably-is subjected to rubber compressing pressure'and the head of the nail spaced from the washer as heretofore described.

The compression of the rubber material of the heel between the washer and its shoe face is illustrated in Figure 3 of the drawings; and on an enlarged scale in Figure 7, in which the nail is shown as driven the appropriate distance and clinched a with its head spaced Figure 8 illusand the driving instrumentalities withdrawn, showing the manner in which the compressed heel material will spring the washer back toward the head of the nail.

J 'In devising mechanical instrumentalities for carrying out thehereinbefore described method, I have selected asa basis, a well 'known type of nailing machine of the single reciprocating driving plunger, fixed stroke type and have provided means, which in cooperation withsuch a machine is'effective to efficiently practice the described process and which in'themselves are productive of novel mechanical functions and structure herein recited and claimed. 1 1

v In Figure 1 oftheappended drawings,

"such a machine is shown and comprises the standard 1 uprising from a suitable base 2 and having an operating head 3 atithe rear of which is supported an operating shaft' l driven by a belt from'a base pulley 5 which receives motion by a belt connection from a suitable over-head line or power shaft.

"W en'd- 's'etin line with 'the dri-veriand the central -aperture in the nozzle 12. In the well known type of nailing machine herein shown, a thin spacer plate 13 (Fig. 6) reciprocated th-rough -a head guided slide 14 and cam and link connections with the power shaft 4, is operated in timed relation to the movement inssaeae Tfo tion is oommu nieated to the operating shaft 4 fromthe power rece'ivingpulley 5 by vneans of a'treadle operated pawl 6 controlling a suitable 01mb. The Lhead at its terw'ard end providesa-plunger barrel 7 and "ofl settherefromilaterally. A nail race-way "*8 inclirring upwardly :to a nail hopper 9 havingthe usual rotating distributing drum 'TQ 'p'uHey drivenfrom thepower shaft 4, 10

is 'cennectednt its lower end with a nozzle member-of novel construction and arrangeqne'n't having a I central nail passage therein of 'adimneter 'to engage and guide the: heads of -the nails-used,'said passage being aligned *axiallywiththe driver 11 connected to and operated by the ower driven plunger guide'd in thebarrel- *for vertical reciprocation -and actuated 'by cam'a'nd leverfrom the powe'r Slltflflfthls plungerancl driver having a fixed= s'troke, predetermined by the formation '(iff fihe cam.

The nailguiding and driving nozzle, previeusly -referred to which is designated gen'eri-callly by the numeral 12 is threaded into the baseof tl1e 1-a'ce way"8 in co-axial alignment the nail driver 11, the nails in the race-way beingfed'in a vertical plane which l b'rin'g them at the lower extremityof the of tl1e plunger and driver -*to feed said nails 'singlyto -the nozzle. ln theinaohine shown,

' the driver 'l l isheldat the lower extremity of its s"troke the'endof the operation, the spacer plate 13- being at that time inserted "between the'two lower-most nails "in the racechute so that as the plunger moves upwardly ait the movement o'f the next clutch initiated operation-of the machlne and rises -a bov'e the end or the raceway, the'lowerunos't nail is fed *into the central nail guide opening of the nozzle 12. The 'last'mounted "shoeto whi'clr theirubb'er heel is'to heapplied ia-supportedfor vertical movement toward and from the nozzle 12' upon. a table15 enclutch controlling pawl iisindicatediat 20,

i fhe 'work table 15 is formed fwithwa radial 'eXtension QI -from which ups'tands a pivot bolti22 embraced*by the' walls of an elongated slotzzfi io'rinedin a narrow arm2'4 extended from a work shifting and carrying plate and 'equi-distant stop lugs 21a. This plate is provided with a suitable manipulating handle26 by means of which itmay be swung to pivot on the bolt 22 or may to position the heel of it carried last and shoe in the proper relation to the operating mechanism of the machine. The last is mounted be rmoved lengthwiselin the slot 23relatively-to the bolt upon a heel pin or last spindle 26 of usua1= 7 construction held by a suitable set screw in fa socket formed in a cylindrical standard=27 having an intermediate Jknurled adjusting rung 28 and reduced .in-diameter at 29' at its merit in the correspondingly threaded centralboreof ablock30. T'hls block is guided for vertical movement upon p1ns31 upstanding from "the work carrying plate- 25 and is moved upwardly manually to clamp the heel i- "againstthe nail nozzle and to apply rubber compressing pressure thereto. This is eftfecte dmanually by'the machine operator through means now to be describedand in order to absorb thenail driving shock-of the machine and relieve the operator, the con neci ion betweenthe manually-operated means and the supported work table includes a spring or resilient member. Accordingly,

the block 30 is provided with'a socket 32therein at one edge extendingdownwardly from the top and terminating adj acent to the bottomof the block. The hooked pin 33 haw ing an abutment washer 34 thereon in line with the socket 32'is secured to the block rigidly and an operating handle35 is pivoted between spaced ears 36 upstanding from the work supporting table 25 by means of a relatively long pivot pin .37, the projecting-ends otwhich outside of the ears are encirclediby 5 the oppositely coiled ends of a spring yoke :38 extending beneath the operating handle and normallyholding it in inoperativepressure applying position. This pressure is effected by means of "a 'foot extension 39 0f the operating lever seating in the base of the --socket 32 andenga-ging the lower end "of a coil spring 40 housed in the :socket 182138 tween the abutment washer 34 and said foot extension. Obviously, by depressing the lever 35, the spring 40 is placed under pressure and through the hook 33 will liftthe block .30 and with it the standard 27 of .the

{heelpin The work table 15 is dropped with the shoe at the end of the nail driving opera- 'l'o'wer end and threaded for vertical adjusttion to permit the removal of the last with 3 its shoe and as in the present case,where the nail operation is performed upon successive portions of'the heel, to permit the last to be swung and adjusted into position for the next nail driving operation. In positioning the heel on the last-carried shoe on the sp1ndle'26,'thework table is moved properly to alinethe heel of the shoe,and tothis point, it should be? stated lthat rubber heels whether side of. the nail raceeway 8 and depending therefrom, the plane of the'base of the foot 41beingadjusted to the plane of the upper ofvthe race-way 8 in axial alignment with the tread face of theheel when next moved into cooperative relation and engagement with the nozzle 12. :To effect this preliminary positioning adjustment ofthe heel, the

knurled ring 28 of the :standard of the last "pin is operated to bring the tread of the heel against the foot. In this position, the block 20 30 is, resting upon the work carrying plate 25. The latter is now. swung throughits handle 26' to bringa washer opening with its ornamental encircling-boss and ,imbedded vwasher inline with the nail driving opening of the nozzlelQ, the lower end of which is 'formed as a conical nose sized to enter in thewasher opemng and engage the washer.

The construction and adjustmentfeatures of this nozzle and its associated parts forms an important feature ofthe present invention and its functions are essential to, the carrying out of the nailing method involved.

The nozzle 12 at its upperend is formed withan externally threaded tube 43,. which screws. into a threaded socket in thewbase nail driver 11 and with theline of nail feed, having a central bore 44; substantially 'coincident in dlamet'er wlth thatlofthe driver 11 andof the nail tobe used and down which the nails are fed by gravity in advance ofthe driver 11. The upper end of thetube 43- is nreferably'fornied as a rounded concavityto facilitate the feedingofthenails. The lower endof the sleeve 43 entersiasocllet 4.5 intern ally threaded for engagement therewith and located in the upper end ofthe body'ofthe nozzle which, as will be seen from Figures 7 and 15, is of flat taperingform with an annular enlargement l6 "at; its base,' reduced in diameter andexternally threanedto provide an externally threaded'sleeye d7 engaged by the internally threaded positioningrring d9 adjustable thereon vertically by eans of the threads and arranged to have its lower edgeiinclo'sing the boss or rim aboutthe' tre'ad of the heel with whichthe naili driving openings and imbedded washer apertures are in axial alignment. The manipulation of the adjusting ring 4 9 will relatively positionthe conical end of the nozzleyerticallyw Such an adjustment is'necessa'ry to compensatejfor variations in the distance of the washerfjfrom --the tread face of the heels. Ordinarily one adjustment is sufiicient for ,a :--run of Eheiels washer; it is essential; that thenaiLbe; driven jstraight in orderg'that ,itmayv be properly clinched and asa prerequisite. to straight dr ving, straight guiding is'necessary; I ;nthenoz- =zleconstruction involved 1 iiL-Ith PQ 'BSQI z llvention, 1adequate,; provision 1s 3 madeito securepropjer guidanceof the HQIlS by PIO-VLCL- slotted-openings 50, inzthe base; of the nozzle and intern allyof theenlargement 46, this recess receiving guiding; lugs. ,51 attached to and depending from the lower end ofgspring lingers, 52 which -.are-attached suitable d screws to the side faces of the nozzleadjacentthe tube thereof, the Jugs-1.51% extending i "h: thelrec'esses and havingitheir inner ;-fac es o3 cencavedftocorrespond substantially to the curvature? of the na-il anddriver. The

eizteriorlv curved andytaperedilbases 54 0f vthese nail guidesformthfe conical lowen-end of theiaozzlewhich projects into the nail {slot and abuts the imbedded Washer; 1 The spring 52 carrying the nail: guides; will yield outfl r wardlycas the nail is, driven, but at no-tiine during the driving of thenailwill they be Tout of contact with thefhead of the nailgas the diameter ofg'driverrandnail,and nozzle "bore andnail guidejaws 51 coincide, sotthat 1 nails will be guided for straight line :movement by the engagementofpits headwiththe 'wall ofthe central-recess55;of the mainbody of the. nozzle whose diametencorres'ponds; to

that of the'nail-heads and driver. ;11 aitl'ldgfiS the ;n ail enters throughth'e central aperture of the washer, its head-engages the'icuryed guiding walls 53 -ofthe guide blocks; 51 'nd spring them outwardly, but'being'heldangengagement therewith by: the ;'tension of. t"he springffingers'52. This movement ofthe guide rblocksr'outwardly is; permitted by ;.opposed slots :56 formed in;- thelenlargement 46 at ,op-

posite sides. of the nozzle body-as bestseen n Figures 9 anrl-15.'l K

Adjustment ofthenozzle body and in a linenlongi-tudinallyQtoT th-egaxispof the driver, I and: relatively to the driver ';to vary'qthe' extent to ,WhiCl itl 6 Li is driven I by the driver; into the shoe, is fefl ectedthrough.

adjustment of the 1 nozzle onythei threaded sleeve 43; Because -ofzthe necessity=of align- "ing the :upper end ofthis sleeve with" the base of the 'nailrace-way,=the-posi'tion of the sleeve in the base oflthe race-wayis fixed, as ;for;in-

stance by a pin or set screw 57 shown in dotted lines 111; Figure and-carried by: the flower -end of the racewayrrThe nozzle-112 therefore is Tturned relativelyzto 'thesleeveja ana thereby raised, or :lowered "with its central mg a nail holding-and guiding surface which extends below. the point at-which :thehead of the-nail is driven. In theilluStrated embodi- "mentcof lily invention, this result is attained by: forming; at diametrically; lopposed points edge will be positioned closely adjacent to the vertically extending face of scale plate 60 secured to and depending from the lower end of the race-Way and having a calibrated scale with which the plate 59 cooperates as an indicator and by means of which, the stroke adjustments of the nozzle may be definitely predetermined. The nut 58, therefore moved independently of the nozzle to the pointon the calibrator scale plate (30, indicating the adjustment required for a particular run of heels, after which it is lined in POSlllOD on the sleeve by a lock nut 61 the body of the nozzle 12 is thereafter rotated and brought into. engagement with the undersur- Lin-r q.

face with; the stop formed by the underfaces of the nut 58 and plate 59.

In adjusting the nozzle for any seriesof nailing operations involving, for example, the usev of rubber heels of the same manufacture which will uniformly gauge for thickness, the requisite nail driving stroke of the plungeris provided for by the adjustment of the nut 58 and plate 59 relatively to the stroke Plate 60 and the nozzle is adjusted accordingly. Ordinarily, also the initial adjustment of the tread engaging ring 49 suflicient to position the conical lower end of the nozzle for proper cooperation with the washer of-any given run of rubber heels, any

" slight or minute variations in the locations of the washers, vertically of the heel being compensated for in the application of pressure to the heel through the spring of the last support. This spring, additionally, is a safeguard against crushing of the washer through improper adjustment of the nozzle. 7 Such an improper adjustment, is'however, most unlikely with the safety factors afforded by the positioning stop 42' which effects a preliminary adjustmentof the tread surface of the the maximum predetermined by the mini mum overall height of the adjusting ring 49 and enlargement 46 in the position shown in Figure 7 of the drawings.

From the foregoing, it will be evident that the operation of the described mechanism,

in inserting fastening or nails in rubber heels in accordance with the method involved herein is; as follows:

The proper adjustments for the driving relatively to stop 42 and throughthe nozzle adjustment just described having been made and the last on its support having been swung to position a nail opening in the heel in line with the lower end of the nozzle, the handle is depressed, lifting the last vertically and forcing theconical lower end ofthe nozzle member into the nail opening and against the washer and compressing the material. besea. the washer and the shoe face of the rubber heel. risthis compression is effected, the operator through treadle 20 tripsthe pawl 6 and-permits theusual one cycle clutch of the machine to operate. As theoperating shaft 4 begins to turn, the driver 11 is lifted, permitting av nail to drop down into the adjusting sleeve bore 44, thencev through the guiding bore of the main body of the nozzle and between the bottom 53, the driver 11. engaging the head and urging it through the jaws and with its pointpenetrating through the'lower portion of the rubber heel, the heel base or lift and against the metal plate upon the heel. of the last by means of which it is clinched. The movement of the driver is arrested before the head of the nail reaches the washer as indicated inFigure 7,. The preliinina y ad ustments based on the size ofv nail used and thickness of heel has predetermined this result. The nail head, being guidedv between the spring pressed jaws 53 whose contour coincides with that of the-edge of the nail head, is maintained in a vertical position during the driving operation and genetration through the rubber heel liftand upper in a straight line is assured. This operation takes place almost instantaneously and the shoe support 15, lever 17, and cam operated link 18 are thereupon actuated to drop the support, permitting the operator to swing the shoe carrying plate 25 to one side for the next height gauging operation and for the positioning of a fresh nail opening for nail insertion. Almost immediately after the shoe support 15 is dropped, it is again raised through the cam into position for the next operation. I find it is more ad vantageous to nail the heel by successive single nail insertions. rather than by the use of gang nailer. One advantage is the great-v er saving effected through dispensing with theme of expensive series of pattern templates and the use of heavier andrnore. expensive gang nailing equipment. In addition'to the saving efiected through lower ins vestment, the new method and mechanism overcomes heel spoilage. The time saved by the gang operation is offset by the time lost in selecting the pattern and aligning it, this advantage being overcome by the speed of successive nailing operations with the lighter machine and the lack of heel spoilage.

In operating upon rubber heels where the washer and nail holes are close to the edge,

stroke of the nail by adjustment of the last it is highly desirable toavoijd driving a nail through the heel into the outer face of the upper at the bottom edge adjoining-the upper edge of the heel. 'This is particularly so in the case of the broad heels and extension heels used in many of the sport type shoes. To overcome this and in accordance with the practice of the method forming the subject matterhereof, I employ what may be termed an angling ring or gauge 62 internally threaded and corresponding to the tread engaging ring 47, except that the lower tread'engaging edge is formed withan in- 'cline 63, best seen in Figures 14 and 16 of the drawings. In operating upon such heels, the shoe is inclined upon the last pin as indicated in Figure 14 and the inclined edge 63 of the tread ring swung to a corresponding incline. When pressure is applied as previously described, the nail will be driven through the opening of the washer and through the shoe at an angle in which the point of the nailinclines toward the median line of the shoe and away from its edge, thereby avoiding projecting into and injuring the lower edge of the upper at the heel.

In Figures 17- 19a modified form of nozzle is shown, in which instead of the tapering flat body shown in Figure 15,a tubular body 64 similarly formed with'a central bore 65 is used, this body having adjacent to its upper end an annular enlargement 66 providing a stop engaging the base of the race-way 8 and positioning the upper end of the tube in proper relation to the race-way. Adjustment to vary the projection of the nail beyond the end of the nozzle through the fixed stroke of the driver'is provided for by a sleet e67 engaging the lower threaded end of the tubular nozzle 64: and having an annularly enlarged base providing a tread engaging flange 68 corresponding to the lower edge of the 7 rings of the tread engagingring or band 49.

The lower end 69 of the nozzle 64 as shown, is tapered, projecting below the foot 68 and into the nailing hole ofthe rubber heel, the extent of the projection being predetermined by the adjustment of the sleeve 67 thereon. When operating upon rubber heels in which the nail holes are positioned close to the edge of the heel, the sleeve member '70 with its inclined or beveled foot 71 as shown in Fig me 18 is substituted for the sleeve 67, the operation being the same as that of the first form of inclined tread engaging sleeve or ring 62 just described. 1

The method and means disclosed herein have been given specific anddetailed disclo sure and embodiment to exemplify the inven-.

' will be obvious also that while the invention strictive sense, unless otherwise requiredby the prior art. i

Having described myinvention' what' I claim and desire to secure by Letters'Pa'tent 1s: i i

l. The method of nailing elastic heels haw= ing imbedded washers to shoes which consists in holding the heel on the shoe under; compression and driving a nail through an imbedded heel washer and into the material of the shoe and arresting such movement of the nail with its head spaced from the washer and thereafter relieving compression'oftlieheel and permitting the compressed material to move the washer relatively to and toward the head of the inserted nail. i 2. The method of nailing elastic heels have ing imbedded washers to shoes which consists" in holding the heel on'the shoe un'derpi'eS sure including pressure applied to an im--' bedded washer, driving a nail throughthe opening of said washer and into the material of the shoe, arresting such movement ofthe nail with its head determinately spaced from" the washer, and thereafter relieving pressure against the washer. 3. The method of nailingelastic heels to shoes at the edgesof the heel whichconsi'sts in holding the heel on the shoe and guiding a nail into and driving it through thee'dge portion of the rubber heel into the shoe with the nail and heel relatively inclined to insert the nail at an angle inclining toward the me-' dian line ofthe shoe. 4. The method of nailing elastic heels hav' ing imbedded washers at the edges of the heel? which consists in holding the'heel on theshoeunder compression and driving a nailthrough an imbedded edge washer with the nailfand' heel relatively inclined'to insert'the nail'at an angle directed toward the median line'of the" shoe and arresting movement of the nai-l'with' its head spaced from the washer and there after relieving compression o the heel. v 5. The method of nailing elastic heels having imbedded washers thereln to shoes which consists in holding the individual nail and washer holes in the tread of the heel succes sively in cooperative relation to single a ct ing nailing means, applying rubber com pressing pressure to the heel "through a washer at the point of the nail insertion,

driving a headed nail through each nail and washer opening with the nail arrested with its head spaced from the imbedded washer and relieving pressure upon thev heel and washer after the nails have been so driven to permit the compressed rubber to move the washer back toward thenail head.

6. Means for attaching elastic heels containing Washers comprising heel engaging instrim'icntalities constructed and arranged to compress the elastic material ofthe heel between a Washer and the shoe and cooperating nail driving instrumentalities constructed and arranged to drive a nail through said washer and the heel While so compressed and to arrest driving movement with the nail head spaced from the Washer.

7. Means for attaching elastic heels containing cavities in their tread faces comprising instrumentalities constructed to engage the heel below a cavity to compress the elastic material below said cavity, and arranged to drive a headed. nail in through the heel at the bottom of the cavity, While so compressed and to arrest said nail With lts head spaced from the compressed base of said avity.

8. Means for attaching elastic heels containing ashore and cavities in their tread faces in register with the Washers comprising instrumentalities constructed to compress the elastic material below said Washers and nailing mechanism constructed to drive headed nails through said Washers and heel with the heel under compression and arranged to arrest said nails with their heads predeterminately spaced from said Washers.

9. Means for attaching elastic heels containing cavities in their tread faces comprising a shoe support and cooperating nailing mechanism providing nail guiding means formed to enter into said cavities and engage the bases thereof, means for effecting relative movement of the shoe support and nail guide to compress the elastic material therebetvveen said nailing mechanism being constructed and arranged to drive a headed nail through said guide and heel With the latter under compression and to arrest the nail With its head spaced from the base of said cavity.

10. A nailing machine having in combination, a work support, a cooperatively positioned reciprocating nail driver having a fixed driving stroke, nail feeding means including a nail guiding nozzle alined With and below the driver and in Which the driver reciprocates and a positioning gage therefor adapted to engage the tread face of the Work, and means for adjusting said nozzle longitudinally of its axis and that of the driver variably to regulate the driver effected projection of nails from said nozzle.

11. A nailing machine for elastic heels having nail securing cavities in their tread faces comprising in combination, a shoe support. a cooperatively positioned reciprocating nail driver having a fixed driving stroke, nail feeding means including a nail guiding nozzle alined With and receiving the driver and nails having its extremity tapered to enter said tread cavities and having a stop member adjacent thereto to engage the tread nail: feeding means including anail guiding;

nozzle alined with and receivingthe driver and nails hav ng its extremity tapered to entersaid tread cavities, and having a positioninggage-adjacent thereto constructed and arranged to engage the tread face of the Work and determinately to position the nozzle extremity in said tread cavities as to'depth and angle of nail insertion relatively to the tread face. i

13". In a nailing machine for elastic heels having nail receiving cavities: in their tread faces, a nail guiding nozzle presenting an ex tremity'tapered to enter in said tread cavities and'havin'g a tread engagingstop member adjustably mounted thereon variably to= pre determine the extent of projection ofthe nozzle extremity into said cavities, said stop member having its tread engaging; face constructed and arranged to cooperate With tread to determine the angle of nail in-' sertion relatively to the plane of the; tread face. v 7

14. A machine for nailing elastic heels having nail receiving cavities their tread faces comprising an operating head, a reciprocating nail driver carried thereby and having a stroke of fixed length, nail feeding mechanism including a heel engaging n-a-il guiding nozzle alined-with said driver and having its extremity formed determinately to project into said cavities, a shoe support on Which a l'astis mounted for movement transversely of and also toward and from sald nozzle, means for moving the supported last and shoe to engage said nozzle extremity in a heel tread cavity under yielding pressure, and means for determinately adjusting said nozzle longitudinally relatively to the stroke of said driver to vary the extent of driver-effected projection of the nail from said nozzle extremity. 15. A machine for nailing elastic heels havmg nail receiving cavities in their tread faces comprising an operating head, a reciprocatlng nail driver carried thereby having a driving stroke of fixed length, nail feeding mechanism including a heel-engaging nail guiding nozzle alined with said driver and having its extremity formed to project into said tread cavities and having means predetermining the extent of such projection, a heel positioning gage in determinate relation to the plane of the nozzle, a shoe support on which a last is mounted for movement transversely of and toward and from saidnozzle including a last pin mounted manually adjustable toward and from said heel positioning gage, means for raising the supported last and shoe to engage said nozzle extremity in the heel tread cavities under yielding pressure effective to compress the elastiomaterial {55 of the heel, means'for drivin nails'through said cavities into the heel while the latter is held so compressed, said nozzle being con-. structed and arranged for longitudinal ads justmentrelatively to the driver stroke .variably to predetermine theextent to which the nail is driven through the heel.

16(In a nailing machine, nailing mecha-Q nism including a driver, nail feeding mechanism including a nail guiding nozzle alined 153 with the driver and adapted to engage the work, and a work support mounted for movement toward and from said nozzle and having a last spindle mount mounted thereon for independent movement toward and from 203 said nozzle, and mean-s for effecting movement thereof toward said nozzle comprising a pivotally mounted operating lever and a compressiblespring interposed between said i lever and the lastspindle mount. a v 253 17. In a nailing machine, nailing mechanism including a reciprocating driver having a fixed driving stroke, nail feeding mechanism includinga nail-guiding work engaging nozzle alined with said driver,.a support upon which said nozzle is adjustable in adi-.

rection longitudinally of the driver stroke variably to predetermine the extent of drivereifected projection of the nails from said nozzle, a seated gauge plate adjacent to said 35; nozzle and in cooperating .adjustment an indicator mounted on said nozzle support independently of the nozzle and acting as an adjustment stop therefor, and means for locking said indicator inadjusted position.

40; ADAM H. PRENZEL. T 

